The pair-interactions U_{ij}(r) determine the thermodynamics and linear transport properties of matter via the pair-distribution functions (PDFs), i.e., g_{ij}(r). Great simplicity is achieved if U_{ij}(r) could be directly used to predict material properties via classical simulations, avoiding many-body wavefunctions. Warm dense matter (WDM) is encountered in quasi-equilibria where the electron temperature $T_e$ differs from the ion temperature T_i, as in laser-heated or in shock-compressed matter. The electron PDFs g_{ee}(r) as perturbed by the ions are used to evaluate fully non-local exchange-correlation corrections to the free energy, using Hydrogen as an example. Electron-ion potentials for ions with a bound core are discussed with Al and Si as examples, for WDM with T_e \ne T_i, and valid for times shorter than the electron-ion relaxation time. In some cases the potentials develop attractive regions, and then become repulsive and `Yukawa-like' for higher $T_e$. These results clarify the origin of initial phonon-hardening and rapid release. Pair-potentials for shock-heated WDM show that phonon hardening would not occur in most such systems. Defining meaningful quasi-equilibrium static transport coefficients consistent with the dynamic values is addressed. There seems to be no meaningful `static conductivity' obtainable by extrapolating experimental or theoretical σ(ω, T_i, T_e) to ω\to 0, unless T_i \to T_e as well. Illustrative calculations of quasi-static resistivities R(T_i,T_e) of laser-heated as well as shock-heated Aluminum and Silicon are presented using our pseudopotentials, pair-potentials and classical integral equations. The quasi-static resistivities display clear differences in their temperature evolutions, but are not the strict ω\to 0 limits of the dynamic values.
Ab initio model of optical properties of two-temperature warm dense matter
我们提出了一个模型来描述两个温度系统的热物理和光学性质的加热电子和冷离子在固体晶格中发生在超快加热实验。我们的模型是基于密度泛函理论框架内的从头计算模拟。通过评估Kubo-Greenwood公式获得光学性质。通过将我们的从头算模型的材料参数应用到双温度模型中，我们能够在相同的理论框架内描述飞秒激光加热金的温度弛豫过程及其光学性质。最近对超快加热金的光学性质的时间分辨测量揭示了飞秒激光脉冲与固态物质之间相互作用的动力学。将从我们的研究的模拟中获得的不同场景与实验数据进行比较[Chen，Holst，Kirkwood，Sametoglu，Reid，Tsui，Recoules和Ng，Phys. Rev. Lett. 110，135001（2013）]。
Experimental Evidence for the Breakdown of Uniform-Electron-Gas Models in Warm Dense Aluminium
European XFEL（欧洲自由电子激光设施）；University of Rostock（罗斯托克大学）；Helmholtz-Zentrum Dresden-Rossendorf (HZDR)（德累斯顿-罗森多夫亥姆霍兹中心）；Center for Advanced Systems Understanding (CASUS)（先进系统理解中心）；Osaka University（大阪大学）；European Synchrotron Radiation Facility (ESRF)（欧洲同步辐射装置）
Informing spectral models for dense plasmas with K-edge absorption measurements of warm dense copper
Lawrence Livermore National Laboratory（劳伦斯利弗莫尔国家实验室）；University of California San Diego（加州大学圣地亚哥分校）；Laboratory for Laser Energetics, University of Rochester（罗切斯特大学激光能量学实验室）；Sandia National Laboratories（桑迪亚国家实验室）；University of Oxford（牛津大学）
